In 2016 the whole head unit packed up on my 2013 GTD, it was a month or two outside the warranty. VW Uk wanted £3500 for a replacement unit, I felt that this was completely unreasonable, as did my dealership. My argument was that it is reasonable to expect an item like an in car entertainment system to last longer than 3 years, it’s not in the same league as tyres, brakes etc. End result? New head unit, no charge. Good luck.